TY - JOUR
T1 - Identification and expression of a novel family of bHLH cDNAs related to Drosophila hairy and enhancer of split
AU - Kokubo, Hiroki
AU - Lun, Yi
AU - Johnson, Randy L.
N1 - Funding Information:
The authors thank Dr. Achim Gossler (Jackson Laboratory) for the generous gift of the dll-1 mutant murine line. This research is supported by a fellowship from the Ministry of Education, Science, Sports, and Culture of Japan and by grants from the MD Anderson Cancer Center, and the NIH.
PY - 1999/7/5
Y1 - 1999/7/5
N2 - In this report we describe the initial characterization of murine, human, and Drosophila hesr-1 (for hairy and enhancer of split related-1) a novel evolutionary conserved family of hairy/enhancer of split homologs. Hesr-1 cDNAs display features typical of hairy and enhancer of split-type bHLH proteins including a N-terminal bHLH domain a conserved orange domain immediately C-terminal to the bHLH region. Despite their similarity to known hairy/enhancer of split homologs, hesr-1 cDNAs are divergent members of the hairy and enhancer of split bHLH family since the degree of sequence identity within the bHLH and their nearest homologs are relatively low. Moreover, the tetrapeptide motif, WRPW, which is found in all hairy and enhancer of split family members, is not present in hesr-1. Rather, a variant of this motif, YRPW, is found. Analysis of embryonic murine hesr-1 expression by in situ hybridization reveals strong expression in the somitic mesoderm, the central nervous system, the kidney, the heart, nasal epithelium, and limbs indicating a role for hesr-1 in the development of these tissues. Like the enhancer of split cDNAs in Drosophila, we show that hesr-1 expression depends critically on signaling through the notch pathway in murine embryos, suggesting that aspects of hesr-1 regulation and function might also be evolutionary conserved.
AB - In this report we describe the initial characterization of murine, human, and Drosophila hesr-1 (for hairy and enhancer of split related-1) a novel evolutionary conserved family of hairy/enhancer of split homologs. Hesr-1 cDNAs display features typical of hairy and enhancer of split-type bHLH proteins including a N-terminal bHLH domain a conserved orange domain immediately C-terminal to the bHLH region. Despite their similarity to known hairy/enhancer of split homologs, hesr-1 cDNAs are divergent members of the hairy and enhancer of split bHLH family since the degree of sequence identity within the bHLH and their nearest homologs are relatively low. Moreover, the tetrapeptide motif, WRPW, which is found in all hairy and enhancer of split family members, is not present in hesr-1. Rather, a variant of this motif, YRPW, is found. Analysis of embryonic murine hesr-1 expression by in situ hybridization reveals strong expression in the somitic mesoderm, the central nervous system, the kidney, the heart, nasal epithelium, and limbs indicating a role for hesr-1 in the development of these tissues. Like the enhancer of split cDNAs in Drosophila, we show that hesr-1 expression depends critically on signaling through the notch pathway in murine embryos, suggesting that aspects of hesr-1 regulation and function might also be evolutionary conserved.
KW - Enhancer of split
KW - Hairy
KW - Hesr-1
KW - Mouse development
KW - bHLH
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U2 - 10.1006/bbrc.1999.0880
DO - 10.1006/bbrc.1999.0880
M3 - Article
C2 - 10403790
AN - SCOPUS:0033526856
SN - 0006-291X
VL - 260
SP - 459
EP - 465
JO - Biochemical and biophysical research communications
JF - Biochemical and biophysical research communications
IS - 2
ER -